on the rubi only the center housing is D44, the tubes are D35 size or D30 for the front. still the axles are 30 splines but i think is the same bearing and c-clip in the rear as on the D35.
Just a note, the TJ/LJ Rubicon D44 is bolt in, not c-clip. Additionally, the tubes for TJ/LJ axles rarely present a problem... the D35 housing flexing and the skinny stock axle shafts are the most common complaints/sources of failure.